1. When a gun fires a shell, what is the total value of both the momentum of the gun and the momentum of the shell added together?
2. On the air track, a glider, A, of mass 0.25 kg is in contact with a glider, B, of mass 0.1 kg. Both are held together against repelling magnets. When they are released, the velocity of A is measured by light gates and comes up on the computer as 0.3 m/s (from right to left). What is the velocity of B?